The Zoell books have to read and the entries fully listed from the beginning on. He changed his numbering system (and split Major and Minor errors/varieties) after the first 2 and then each successive volume/edition was IN ADDITION TO WHAT WAS ALREADY PUBLISHED. The 4th added on to all the material that was in the first 3, the 5th added to what was in the previous 4 and so on.

Although what you have here is a great start, it is the listing of only a single edition of what are Minor Errors. I sold my complete set (6 books) to a young collector to get him started so I can't check for sure. There should be members here that can add the 4-5 volumes that you don't have listed to make your great reference fully intact.